Energy dissipation and modulus defect in heterogeneous systems based on flexible-chain linear polymers

Klepko, V.V.; Колупаев, Б. Б.; Kolupaev, B. S.; Lebedev, E. V.

doi:10.1134/s1560090407010058

Cited by 13 publications

(6 citation statements)

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“…The PVC-MWCNT complex formed a donor-acceptor conjunction on interface of the polymer-nanotube phase. The interaction of polymer macromolecules and nanotubes is defined by the presence of a monomer PVC unit with a Cl atom as electron donor, CNT as acceptors, and a high value of affinity energy to electrons [27]. In a monomer PVC unit a Cl atom occupies more than half of the weight and therefore its interaction with the active centre on a nanotube surface should lead to growth of Young's and shift modulus.…”

Section: Microhardness Of Radiation-modified Pvc-mwcnt Nanocompositesmentioning

confidence: 99%

Radiation modification of polyvinyl chloride nanocomposites with multi‐walled carbon nanotubes

Ritter¹,

Scharff

Pinchuk

et al. 2010

Materialwissenschaft Werkst

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The influence of high-energy electron irradiation (E e = 1.8 MeV) on the structure and the vibration properties of multi-walled carbon nanotubes (MWCNTs) in a width range of absorption doses (3 -10) MGy were investigated by means of X-ray diffraction and Raman spectroscopy. It has been observed that the radiation promotes the weakness of the interlayer interactions as well as the damage of the cross-linking along a radial direction, due to occurrence of the sp 3 -hybridized states. The filling of polyvinyl chloride (PVC) by nanotubes, in low content (0.2 and 0.5 wt%), leads to an amplification of the microhardness. This can be attributed to the existence of donor-acceptor interactions between polymeric macromolecules and nanotubes, which promotes a reduction of infringements in the conjugation chain of the polyene consistencies. However, the corresponding Raman spectrum cannot explain such enhancement of the microhardness.

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Section: Microhardness Of Radiation-modified Pvc-mwcnt Nanocompositesmentioning

confidence: 99%

Radiation modification of polyvinyl chloride nanocomposites with multi‐walled carbon nanotubes

Ritter¹,

Scharff

Pinchuk

et al. 2010

Materialwissenschaft Werkst

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“…There are several forms of it, such as infrared interaction (the photon gives rise to a transverse optical phonon) [8], optical interaction (photon scattering in the region of optical frequency interval) [9], x-ray interaction (structural x-ray scattering) [1], γ radiation [21], neutron interaction [18], and others [31]. In these cases the unusual behavior of polymers manifests itself in the fact that the structural elements of a substance can be excited in a certain region of actions of energy fields [29]. This can substantially change the heat conduction of a material [22].…”

mentioning

confidence: 99%

“…The intensity of their local (at T < T v ) and segmental (at T > T v ) mobility increases; this leads to a growth in the value of phonon "thermal pressure," which is compensated by the grown internal pressure due to the forces of inter-and intramolecular interaction. It has been established [29] that the "thermal pressure" of phonons decreases as the free volume grows, i.e., it is in proportion to V −1 , and the equilibrium of the system is realized due to its elastic reaction to the energy action. Consequently, the growth in the free volume [17] owing to the decrease in the forces of interaction between structural elements, as the temperature grows, leads to a change in the internal pressure, the phonon pressure, and hence in λ 2 = f(T).…”

mentioning

confidence: 99%

“…For this purpose, we assume, following [29], that photons produce a nonequilibrium energy distribution of structural elements as material particles of a body. Those of them that reach the activation energy migrate, in a diffusion manner, into the surroundings of other atoms.…”

mentioning

confidence: 99%

“…where v lon and v tr were determined by the pulse method combined with the rotating-plate method at a frequency of 0.4 MHz [29]. The material's density was investigated according to [30].…”

mentioning

confidence: 99%

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Mechanisms of heat transfer on polyvinylchloride and poly(vinyl butyral)

Колупаев

Klepko

Lebedev

2012

J Eng Phys Thermophy

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Results of experimental investigation and estimates of the contributions of the phonon, diffusion, and photoncomponents of thermal conductivity of polyvinylchloride and poly (vinyl butyral) in the range 290 K ≤ T ≤ T v + 40 K have been presented. It has been shown that the phonon mechanism of heat transfer predominates at 293 K ≤ T < T v , and the diffusion mechanism, when T ≥ T v . The value of the photon component of thermal conductivity nonlinearly decreases throughout the T range.Introduction. The quantitative characteristic of the efficiency of the process of transfer of thermal energy from a more heated part of a body to a less heated part is its thermal-conductivity coefficient λ.Pioneering works on investigation of λ of dielectrics, among which are most of the organic polymers, belong to P. Debye, R. Peierls, K. Eierman, P. Klemens, et al. The history and works on this issue up to 1978 have been reviewed by I. I. Perepechko in [1] and up to 1982, by Yu. K. Godovskii in [2], where it has been indicated that most of the carried-out investigations sought to establish the dependence of λ on the structure, the chemical composition, and the temperature of condensed media. For amorphous polymers, the most developed is the Eierman model [3]; however, it has a number of substantial drawbacks [4] and is inapplicable to systems with a complex structure. Since heat conduction in its physical meaning characterizes the capability of a body for transferring thermal energy through the interaction of atoms, atomic groups, and parts of macromolecules [5], the value of λ is largely determined by the intensity and character of intra-and intermolecular interaction. Theories concerning the heat conduction of polymers use the model approach characteristic of liquids [6] and/or the scattering of phonons, which are considered as heat carriers only conventionally [7]. In this case phonons as carriers of thermal energy of a body [8] interact with each other via nonlinear properties of a medium [9]. This leads to an energy redistribution between shear and longitudinal vibrations of structural elements, whereas the macroscopic flow of kinetic energy appears as the heat flux [10]. One recognizes [11] three characteristics of thermal motion in polymers: fast relaxation processes -motion of parts of a macromolecule, side chains, or individual atomic groups, sharp increase in segmental mobility (principal relaxation region), and viscous-friction background [12]. It has been proved [13] that the entire spectrum of interchain vibrations can be represented by one parameter, i.e., the characteristic temperature of a body θ. Klemens [7] has assumed that the major contribution to the low-temperature thermal conductivity is made by longitudinal waves (longitudinal phonons). The process of transformation of longitudinal waves into transverse waves limits the mean free path of a phonon, which affects the character of the dependence λ = f(T) [1]. However, this brings up a number of unsolved problems associated with the introduction and selection ...

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Influence of Material Damage on the Parameters of a Nonlinear Flexible Wave Which Spread in a Beam

Brikkel

Ерофеев

2021

Communications in Computer and Information Science

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Energy dissipation and modulus defect in heterogeneous systems based on flexible-chain linear polymers

Cited by 13 publications

References 1 publication

Radiation modification of polyvinyl chloride nanocomposites with multi‐walled carbon nanotubes

Radiation modification of polyvinyl chloride nanocomposites with multi‐walled carbon nanotubes

Mechanisms of heat transfer on polyvinylchloride and poly(vinyl butyral)

Influence of Material Damage on the Parameters of a Nonlinear Flexible Wave Which Spread in a Beam

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